428571430

Appears in sequences

• k times k+6 gives the concatenation of two numbers m and m+7.at n=14A116339
• Sub-Kaprekar numbers (2): n such that n=r-q and n^2=q*10^m+r, for some m>=1, q>=0, 0<=r<10^m, with n not a power of 10.at n=19A118938